lua: remove usage of luaL_reg in favor of luaL_Reg

The former was deprecated with 5.1, and removed entirely in later versions and in LuaJIT

libaegisub/lua/modules/lpeg.c

@@ -2334,7 +2334,7 @@ static int matchl (lua_State *L) {
 }
 
 
-static struct luaL_reg pattreg[] = {
+static struct luaL_Reg pattreg[] = {
   {"match", matchl},
   {"print", printpat_l},
   {"locale", locale_l},
@@ -2360,7 +2360,7 @@ static struct luaL_reg pattreg[] = {
 };
 
 
-static struct luaL_reg metapattreg[] = {
+static struct luaL_Reg metapattreg[] = {
   {"__add", union_l},
   {"__pow", star_l},
   {"__sub", diff_l},

subprojects/luabins/src/luabins.c

@@ -54,7 +54,7 @@ static int l_load(lua_State * L)
 }
 
 /* luabins Lua module API */
-static const struct luaL_reg R[] =
+static const struct luaL_Reg R[] =
 {
   { "save", l_save },
   { "load", l_load },